Simulation Study Of Vehicle Dynamics Control Based On Suspension System

Recent years, in order to improve vehicle's comfort, safety and operation stability, a large number of electronic control techniques and control systems are developed greatly and applied widely. The research on Chassis dynamics control is very important for improving the overall performance of the vehicle.First, pavement surface evenness and time domain model of road excitation are analysed in the paper. On basis of introducing the essential characteristics of electro-rheological fluid, this paper presents semi-active control for suspension based on ER damper and establishes 1/4,1/2 and full car dynamic model.According to sliding model control theory, the parameters of the switching surface are determined by the method of pole assignment. A proportion switching method is used to determine the control rate for 1/4 car model and the RBF neural network arithmetic is introduced to optimize the sliding mode control result. The order hierarchical method and the free hierarchical method are used to design the multivariable sliding mode controller for 1/2 and full car model.The performance of the controlled suspension was simulated considering random road. The simulation results indicated that the proposed sliding mode controllers have good stability and the important parameters of suspension have significantly improvements. The simulation results also demonstrate the effectiveness of the designed sliding mode controllers.At present, many electronic control systems only improve the performance of some part but not considered the interaction between the various subsystems when the vehicle is driving. This paper put the suspension system into the vehicle dynamic integrated control. An integrated controller of semi-active suspension system and Vehicle Anti—lock Braking System (ABS) is built on the basis of the sliding mode control theory. The simulation results show that the controller can not only effectively prevent the wheel locked, significantly shorten the braking distance and braking time, but also can improve the vehicle's comfort.